If I am correct (and Discraft throwers please correct me if I’m wrong) Z plastic is similar to Champ plastic for Innova. The 168 is in good shape as it was my back up. It has some scuffmarks on the rim because I skipped it off an asphalt path a couple of times (not on purpose) but is still flies nicely. The 171 used to be my main driver and is a little more beat in. I can send you pics of them both if you want.
Throw What You Know.
"Gravity, she's a harsh mistress." -The Tick